Brake drum



J. H. BARNES BRAKE DRUM Original Filed Nov. 17, 1951 w i8 k 7 19; X I IHan F1 INVENTOR.

JAMESHBARNES.

ATTORNEY.

Patented Oct. 8, 1935 UNITED STATES PATENT OFFICE BRAKE DRUM Substitutefor application Serial No. 575,521, No-

vember 1'7, 1931.

1 Claim.

This application is a substitute for my earlier application Serial No.575,521, filed November 17, 1931.

My invention relates to the art of brake drums and it has been myparticular object to provide an integral hub and drum constructionaffording an arrangement whereby the drum portion may be readilyreplaced in case it becomes worn. One of the primary objections tocombined hub and drum constructions of the prior art has been thenecessity of discarding the entire structure when the friction surfaceof the drum alone has become worn. I have sought to remedy thisobjection by devising a hub and drum arrangement aflording provision forthe location of a separate drum against the hub portion of the compositehub and drum in case the original braking surface becomes worn. Afurther aspect of my invention relates to the method whereby the useddrum surface may be removed and a new one substituted.

Further objects and advantages of my invention will be obvious from areading of the subjoined specification, in the light of the attacheddrawing, in which,

Fig. l is a central axial sectional view through my improved compositehub and drum, and

Fig. 2 is a view similar to Fig. 1 illustrating the removal of theoriginal drum surface on this composite article and the replacementthereof in accordance with my invention by a separate brake drum. I

Referring to the drawing by reference characters, the numeral l9indicates the hub of my invention. This hub is provided in conventionalF fashion with a radially extending brake flange ll terminating in aconically extending portion l2 which is in turn flanged axially inwardlyat l3 and radially outwardly at It to constitute an axially extendingbrake drum surface terminating in a stiffening flange. In 1 Thisapplication April 27, 1934, Serial No. 722,622

secured to the hub flange ll through openings therein extendingannularly thereabout in a zone radially outwardly spaced from theannular ledge 55. Th se studs serve to secure the wheel body in placeagainst the outer side of the hub flange through their coaction withnuts which engage the threaded shanks of the studs outwardly of thewheel body and abut the face of the wheel body to effect its securement.

In the practice of my invention, when the braking surface It becomesworn, the drum portion of the composite article is machined off along anannular line, as indicated at X and a special drum ll seated upon theannular axially extend ing ledge i5 and the radial seating abutment l5and secured thereto by special studs 2! which are longer than the studsfurnished with the composite hub and drum as original equipment andwhich serve to secure the separate drum H in place. This separate drumis formed with an annular seating portion [9 adapted to seat against andbe centered by the ledge l5 of the hub flange, a radial flange portion[9 seating against the radial seating abutment l5 of the hub flange, andis further provided with an axially extending flange E8 adapted toconstitute the braking surface of the drum. It will thus be obvious thatI have devised a superior composite drum and an improved method ofreplacing the braking surface thereof.

Modifications will be obvious to those skilled in the art and I do nottherefore wish to be limited except by the scope of my sub-joined claimas interpreted in the light of the generic 3 spirit of my invention,

What is claimed is:

A composite hub and drum comprising a barrel portion, a radiallyextending flange portion and an axially extending braking portionconstituting a continuation of said flange portion, all an integral onepiece fabrication, said flange portion being provided additionally withaxial aligning and radial seating abutment means for a replacement drum.

- JAMES H. BARNES.

